摘要：From the analysis of the relation between pH and oxidation-reduction potential of artificial iron springs, the following facts were revealed. 1) In natural, strongly acidic vitriol spring, ferric ion exists mainly in the form of a complex cation, FeSO+4 with sulfate ion, and its potential is given by equation (23). 2) In natural, weakly acidic vitriol spring, ferric ion forms FeSO+4, FeOH2+, and Fe (OH)+2, and its potential is given by equation (32). 3) In natural iron spring, much more weakly acidic than the above two cases, such as iron bicarbonated or iron carbondioxated springs, ferric ion deposits mainly as Fe (OH)3, and its potential is given by equation (26). Ferrous ion in natural strongly acidic vitriol springs is easily oxidized by air to ferric sulfate complex cation, the oxidation velocity of which is more rapid than that of the artificial spring. Based on the test of artificial springs, it was assumed that a trace of vanadium, platinum, copper, and the like may catalyze the oxidation of ferrous ion by air in natural acidic vitriol springs.
